topic Re: Probleme with objects transpary without backgroung in Arnold in Maya Shading, Lighting and Rendering Forum

Probleme with objects transpary without backgroung in Arnold

ejpaul — Tue, 01 May 2018 13:23:24 GMT

I use SkydomeLight. Il put the camera to 0 in order to render without backgound. When rendered, avery transparent objet is opaque, no transparency. can some one help ?

Re: Probleme with objects transpary without backgroung in Arnold

mspeer — Tue, 01 May 2018 14:41:27 GMT

Hi!

Screenshot please.

Re: Probleme with objects transpary without backgroung in Arnold

ejpaul — Tue, 01 May 2018 15:37:14 GMT

red cross in the glass. should be transparentred cross in the glass. should be transparent. the opaque attribute of The glass objet is unchecked.

I tryed this with many other simple scenes, I incounter the same problems ! Try render a single glass, without backgroung when u use the skydome light, same problem. Where there is hole it is ok, but objets with tranparency are not

thanks

Re: Probleme with objects transpary without backgroung in Arnold

mspeer — Tue, 01 May 2018 16:03:19 GMT

Hi!

Every solid object will create a white Alpha channel regardless of transparency, that's correct.

(You still have reflections and refractions with a transparent object.)

Use Render Layers or AOV ID for alpha instead.

(Keep in mind that in compositing it may look wrong because of missing reflections and refractions then.)

Composite transparent objects is not as easy as you might think.

Re: Probleme with objects transpary without backgroung in Arnold

ejpaul — Wed, 02 May 2018 09:21:57 GMT

Ok thanks for ur help. I'll try AOVs today. But this works perfectly with Mental Ray Maya 2017.

Please if possible, try to render a simple water glass without background, using Arnold. Help me if U get it.

Thanks again . Sorry for my poor English.

Re: Probleme with objects transpary without backgroung in Arnold

mspeer — Wed, 02 May 2018 12:22:35 GMT

Hi!

With Mental Ray it worked also only in some rare cases.

Compositing of transparent objects is also far more complex then you might think of.